We probably all have a rough idea of how exactly a snowflake forms high above our heads, but BytesizeScience breaks down the specifics of why every flake has six sides, how they can become so intricate, and why there might actually be plenty of them that look exactly the same.

Turns out it's more nurture than nature. Temperatures, thermals, and other factors all come into play as it freezes and expands into the hexagonal masterpiece that has become a symbol of the season. [YouTube]